Screening Machine Explosion Protection via Multi-Wall Anti-Propagation Devices
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Solution Overview
Problem
Existing screening machines for solid materials, particularly those that generate potentially explosive dust like small wood shavings, are inadequately protected against explosions, as current passive protection devices are mainly attached to the upper wall and cannot effectively propagate pressure waves and flames from lower compartment explosions to the outside.
Innovation Solution
The screening machine is equipped with a plurality of anti-propagation devices, including at least one on the upper wall and additional devices on the perimeter walls, connected via a decoupling and sealing mechanism that ensures the sensitive parts of the devices are exposed to the inside of the screening box without providing a sealing function, thereby allowing effective propagation of pressure waves and prevention of flame spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive protection devices are attached only to the upper wall of the screening box, then the structure is simple and easy to install, but the devices cannot adequately protect both upper and lower compartments from explosions
Solution Approach 1:
The invention divides the anti-propagation protection into multiple segments by installing devices on both the upper wall and lateral walls of the screening box. Each device serves a specific compartment (upper or lower), ensuring that explosions in any compartment can be effectively contained without requiring a single complex device to protect all areas.
2Reliability
If anti-propagation devices are installed on lateral walls, then both upper and lower compartments can be protected, but the devices may interfere with material flow and screening operation
Solution Approach 1:
The anti-propagation devices are strategically positioned at specific locations on the lateral walls where they provide explosion protection without obstructing the main material flow paths. The devices are installed in areas where their presence does not interfere with the screening surfaces or material movement, maintaining local operational quality while providing global protection.
3Reliability
If connection devices are used to attach anti-propagation devices to perimeter walls, then the sensitive parts remain exposed without sealing function, but the installation becomes more complex
Solution Approach 1:
The connection device separates the sealing function from the anti-propagation function. The sealing elements are extracted and integrated into the connection device structure itself, while the anti-propagation device remains exposed to the interior space. This allows pressure waves to reach the sensitive parts effectively while maintaining proper sealing, without requiring the anti-propagation device to have integrated sealing capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures that explosions occurring in both upper and lower compartments can propagate safely to the outside, preventing damage to the screening machine and maintaining operational safety.
Implementation Method 1
passive protection devices comprise anti-propagation membranes or valves communicating with the inside of the screening box in order to propagate the pressure wave generated by the explosion in appropriate directions toward the outside of the box
Implementation Method 2
Some types of these passive protection devices are also equipped with a box-like member associated with the membrane and provided with at least one flame arrestor grate to arrest the flames caused by the explosion that are propagated outside the machine
Data Source
AI summary
Screening machine (10) for screening solid materials, comprising both a screening box (12) shaped so as to have a plurality of perimeter walls (16, 17, 19, 21) and an upper wall (15), and configured to make said solid materials to be screened flow inside it, and also a plurality of anti-propagation devices (27), at least a first of which is disposed on said upper wall (15).